Claude’s new rules against game cloning won’t stop the AI copying boom

Anthropic introduced a restriction in Claude's system prompt (named 'tengu_heron_brook') discouraging the model from recreating existing games while allowing original or user-designed games. The rule appeared in mid-to-late October across Claude Code and Claude Opus 5.5 versions. While the measure aims to reduce legal liability, observers note it is unlikely to meaningfully slow the broader wave of AI-driven game porting already underway in the industry.

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